About Dr Gregor Verbic

Dr Gregor Verbic's research aims to find ways of harnessing untapped potential of large number of distributed energy resources to enable their participation in system support. This will facilitate integration of intermittent energy sources, increase energy efficiency and defer capital investment in large central generation plants and in electricity network upgrade.

Dr Verbic's research interests are in various smart grid issues, with special emphasis on distributed energy resources (DERs), in particular their integration into the system and participation in ancillary services. Lately, Dr Verbic has been mostly focusing on aggregation and control of DERs at the residential level, including smart appliances and electric vehicles, proposing ways how DERs can be used in balancing the increasingly volatile generation, dominated by intermittent renewable generation. He is focusing on scalable control algorithms enabling seamless integration and plug and play functionality. The aim is to empower the distribution system operator to control large number of DER as a virtual power plant. Dr Verbic is also interested in wind power integration, focusing of ancillary services, mostly frequency control, and market implications. He has proposed a novel control algorithm that enables participation of wind power system in system support by providing frequency regulation capability. The need for de-loaded operation is significantly reduced since the proposed approach makes it possible to use the kinetic energy of the rotating masses for this purpose.

Dr Verbic’s major research contribution is in the field of voltage stability, where he proposed a novel method for voltage instability prediction based on local voltage and current phasors. As opposed to the vast majority of other methods that treat the system as a whole, Dr Verbic’s approach needs only the information that is readily available at every bus in the system that is equipped with a phasor measurement unit. As being rather unique, there are several advantages to this approach, most notably computational efficiency and no need for a communication link with a control centre, which means that it is completely local. The results of his research were well accepted in the research community, including the IEEE prize paper award in 2006. Dr Verbic’s research work later focused to various areas related to electricity markets. For example, research on pricing ancillary services deals with a problem of pricing of power-reserves for frequency control. The proposed methods are well suited to small power systems, where an insufficient number of potential bidders makes an ancillary-services market difficult to organize. The main contribution is probabilistic treatment of the underlying problem. Dr Verbic extended his research on probabilistic modelling of power systems during his one year stay at University of Waterloo, Canada funded by a prestigious NSERC-NATO postdoctoral fellowship. Dr Verbic worked on probabilistic assessment of electricity market’s operation, dealing with a problem of how to account for uncertainties in the optimal power flow problem in the context of competitive electricity markets. Dr Verbic subsequent research effort focused on developing new methods and tools for stochastic optimization of multi energy carrier systems, including intermittent energy sources and hydrogen.

Dr Verbic's research features the following highlights:

  • In excess of $1 million of competitive research funding in Australia in Slovenia
  • 14 peer reviewed papers in top journals in the field
  • 211 citations based on scopus.com
  • citation h index of 8
  • NATO-NSERC Postdoctoral Fellow at the University of Waterloo, ON, Canada under supervision of Prof. Claudio Canizares in 2005.
  • Reviewer in the following journals: IEEE Transactions on Power Systems, IEEE Transactions on Power Delivery, IEEE Transactions on Smart Grids, IEEE Transactions on Sustainable Energy, IET Generation, Transmission & Distribution, IET Renewable Power Generation, Electric Power Systems Research, International Journal of Electrical Power & Energy Systems, Wind Energy.

Selected publications

  • Andraž Žertek, Gregor Verbič, Miloš Pantoš, "Optimized Control Approach for Frequency-Control Contribution of Variable Speed Wind Turbines", to appear in IET Renewable Power Generation.
  • Gregor Taljan, Gregor Verbič, Miloš Pantoš, Manfred Sakulin, Lothar Fickert, "Optimal Sizing of Biomass-Fired Organic Rankine Cycle CHP System with Heat Storage", to appear in Renewable Energy.
  • Gregor Taljan, Claudio Cañizares, Michael Fowler, Gregor Verbič, "The Feasibility of Hydrogen Storage for Mixed Wind-nuclear power plants", IEEE trans. power syst., vol. 23, no. 3, pages 1507-1518, 2008.
  • Gregor Taljan, Claudio Cañizares, Michael Fowler, Gregor Verbič, "Hydrogen Storage for Mixed Wind-Nuclear Power Plants in the Context of a Hydrogen Economy", International Journal of Hydrogen Energy, vol. 33, no. 17, pages 4463-4712, 2008.
  • Gregor Verbič, Claudio A. Cañizares, "Probabilistic optimal power flow in electricity markets based on a two-point estimate method", IEEE trans. power syst., vol. 21, no. 4, pages 1883-1893, Nov. 2006.
  • Ivan Šmon, Gregor Verbič, Ferdinand Gubina, "Local voltage-stability index using Tellegen's theorem", IEEE trans. power syst., vol. 21, no. 3, pages 1267-1275, Aug. 2006.
  • Gregor Verbič, Miloš Pantoš, Ferdinand Gubina, "On voltage collapse and apparent-power losses", Electr. power syst. res., vol. 76, pages 760-767, 2006.
  • Miloš Pantoš, Gregor Verbič, Ferdinand Gubina, "Modified topological generation and load distribution factors", IEEE trans. power syst., vol. 20, no. 4, pages 1998-2005, nov. 2005.
  • Gregor Verbič, Ferdinand Gubina, "Cost-based models for the power-reserve pricing of frequency control", IEEE trans. power syst., vol. 19, no. 4, pages 1853-1858, 2004.
  • Gregor Verbič, Ferdinand Gubina, "A new concept of voltage-collapse protection based on local phasors", IEEE trans. power deliv., vol. 19, no. 2, pages 576-581, 2004.